Hmmm... I found this site
http://www.winnfelinehealth.org/heal...hyroidism.html
Quote:
...it has been recognized that many hyperthyroid cats have concurrent chronic kidney failure that is being masked by the effects of hyperthyroidism. It has also been found that treatments directed at curing hyperthyroidism in these patients could lead to a worsening of their kidney function.
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You have not mentioned anything about Kitty's kidney status... If you are leaning toward the radioiodine treatment you may want to investigate the kidney issue further.
My family has had pets (dogs and cats) well into their late teens... we have done both, operations and making life as comfortable as possible. I can understand your position... to do or not to do. I would personally try to get some clarification on the heart and kidney status and go from there.
Best wishes for you all...